I asked the JREF forum for some ideas about insect questions, and one was about a shiny green or teal bee. I’m guessing it was a halictid, which are my pick for some of the most beautiful bees around, as well as native pollinator species in the US.
They are sometimes called sweat bees, although I’ve never had them show any interest in my perspiration. These little solitary bees are pollen feeders, and provision their young with pollen as well. They burrow in the ground, and while they are not social, they do tend to nest in groups.
More lovely photos at BugNet.
(image via Wikipedia)